The effect of laser on the frequency of metal transfer and welding current in Nd:YAG laser+P-GMA (pulsed gas metal arc) hybrid welding was studied. The results show that the addition of laser energy into P-GMAW (pulsed gas metal arc welding) process can help to increase the frequency of metal transfer at the lower welding current and decrease its frequency at higher welding current. The addition of laser energy can reduce the welding current of P-GMAW,but its effect is very weak. The analyses indicate that the laser exerts the influence on metal transfer by the vaporization of material and the interaction between laser induced plasma and arc plasma,and its effects on welding current are exerted by the interaction between laser induced plasma and arc plasma.